North American Fruit Explorers mailing list at ibiblio

["Ernest Plutko" <ernestplutko@wiktel.com>]

The Northern Lights apple, Harelred apple and Golden Spice pear
didn't make it through the winter.  I planted them last Spring.  Too
cold even though they are labeled as zone 3.  Frost tonight, snow on
ground last week, frosts almost every night.  Winter never ends. 
Leaves on trees are very shy about opening this Spring.    Zone
labeling on fruit trees are too optimistic.  It was -45 F or colder
last Winter.

Minnesota zone 3 or maybe zone 2.